package cn.usian.common;

import cn.usian.pojo.Student;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler)throws Exception {
        Student student = (Student) request.getSession().getAttribute("student");
        if(student!=null){
            return true;  //放行
        }
        response.sendRedirect("/login");
        return false;  //拦截
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response,
                           Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                                Object handler, Exception ex)throws Exception {
    }

}
